油的型号是怎样定的如何选用(国外英文资料).docVIP

油的型号是怎样定的如何选用(国外英文资料) How is the oil model determined? How to choose? Each lubricating oil of formal manufacturers must be prominently marked in the product packaging product brand, brand is composed of a group of Numbers and English letters together, such as: 15 w / 40 sg, 5 w / 30 sj, etc. The figures in front of the card number are: 15W / 40, 5W / 30, which represents the viscosity grade of gasoline engine oil, and the later letters, such as SG and SJ, represent the quality grade of gasoline engine oil. In other words, the viscosity number of the engine oil is made up of two parts, namely the viscosity and quality grade, which is the key to the quality of the engine oil. Take the case of 15 w / 40 sg: 15 w 40 SG Low temperature viscosity rating Quality grade is divided into: according to the world through the American petroleum institute of SPI, the classification of gasoline engine oil as S as the series of SA, SB, SC, SD, SF, SG, SH, SJ, such as multiple level, Chinas national standard is equivalent classified using this method. Quality, in turn, in alphabetical order, namely the SJ level of lubricating oil is the worlds highest level and best quality of gasoline engine oil, the Great Wall of common on the market fusion engine oil, mobil 1 all belong to SJ level; SH, the market has Great Wall oil, mobil, etc. The SF, SE, is a mid-range product. Here is the division of gasoline engine oil viscosity grade: according to the world recognized as set by the American society of automotive engineers SAE viscosity grade, according to the high and low temperature fluidity of the product can be divided into: W and the W series. The W series is divided mainly by the low temperature performance of oil products, the smaller the number of W, the better the low temperature performance, the more cold the temperature can be used. For example: the 15W / 40 viscosity level has the high and low temperature performance of the oil, we call it multi-stage oil, which can be used in wi